as·sent / əˈsent/ • n. the expression of approval or agreement: a loud murmur of assent he nodded assent. ∎  official agreement or sanction: the governor has power to withhold his assent from a bill.• v. [intr.] express approval or agreement, typically officially: Roosevelt assented to the agreement.DERIVATIVES: as·sent·er n.

ASSENT

An intentional approval of known facts that are offered by another for acceptance; agreement; consent.

Express assent is manifest confirmation of a position for approval. Implied assent is that which the law presumes to exist because the conduct of the parties demonstrates their intentions. Mutual assent, sometimes called the meeting of the minds of the parties, is the reciprocal agreement of each party to accept all the terms and conditions in a contract.

assent vb. XIII. — OF. assentir (AN. assenter) :- L. assentīre, f. AS- + sentīre feel, think.
So assent sb. XIII.

assent (ă-sent) n. agreement to undergo medical treatment obtained from an adult or child who is legally incompetent to consent.